| 초록 |
Recently, cesium(Cs) based all-inorganic perovskite materials show great potential for photovoltaic applications due to their high charge carrier mobility, long charge diffusion length, and good thermal and light stability. In this study, we report CsPbIBr2 perovskite solar cells with MgO modified mesoporous TiO2 (mp-TiO2) based electron transporting layer (ETL) between CsPbIBr2 and blocking TiO2 (bl-TiO2). The optimized CsPbIBr2 perovskite solar cells with MgO modified mp-TiO2 exhibited higher power conversion efficiency of 5.39% under AM1.5G illumination in comparison to the 4.13% solar cell efficiency with control mp-TiO2. It is found that MgO modification can shift the work function of the ETL upward by 0.2 eV. The elevated conduction band minimum (CBM) contributes to the increase of the VOC, JSC, and FF. (This work was supported by the DGIST R&D Program of the Ministry of Science and ICT of Korea (19-ET-01).) |
